Gas Insulated Switchgear (GIS) 550Kv

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Lightweight enclosures of aluminum with good conductivity, no eddy-current losses and a high resistance to corrosion
Single-phase encapsulated design, assuring minimal dielectric and dynamic stresses
The electromagnetic compatibility of the switchgear, both externally and internally, prevents interference voltages and over-voltages
Increased personnel safety
Horizontal circuit breaker design saving building elevation and cost, ensuring convenient personnel access
On line condition monitoring and synchronized switching options
Short erection times and high reliability, by providing large transport units assembled and tested in the factory

Rated voltage	550kV
Rated current	4000A /6000A（busbar）
Rated frequency	50 Hz
Rated short-time withstand current(3s)	63kA
Rated peak withstand current	171kA
Rated short-circuit breaking current	63kA
Rated making current	171kA
Rated power frequency withstand voltage(1 min.)	740kV
Rated switching impulse withstand voltage	1300kV
Rated lightning impulse withstand voltage	1675kV
Leakage rate/ year and gas compartment	≤0.5%
Operating sequence	O-0.3s-CO-180s-CO
Ambient temperature	-30…+40 ℃